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No $HTTP_REFERER in NS

If I'm calling my php-script by an IMG-tag (e.g. <IMG src='http://www.somethi.ng/myscript.php'> )
everything works fine and $HTTP_REFERER is around. Like this I can get the calling page's URL (where the img-tag was placed)

Now, I want to call this php-script by JavaScript (e.g. <script language='JavaScript' src='http://www.somethi.ng/myscript.php'></script> )
In IE this works perfectly and $HTTP_REFERER gets the correct value. In NS (4.77 or NS6, same thing) $HTTP_REFERER is undefined and I have no idea how to get the calling page's URL!

I'd appreciate your help. I've been working on this for quite a long time and I need to get a solution.